So, how to grade air guns design and OEM selection of O-rings. You can't live with air guns and not have o-rings. So, 1) what is the best material for air gun O-rings? @) Do different areas/applications require different materials and/or durometers. 3) Do manufacturers just throw whatever size and type of o-ring than can get in terms of economy of scale? 4) Can I select a better O-ring, including size, material and durometer than OEM? I would suggest that an airgun that uses fewer O-rings might be a better design? So in the sales pitch of an airgun why not pitch O-ring replacement advantages.
For instance, an air gun leaks. Instead of having the owner agonize of where the leak is, why not just design the gun to easily change out the O-rings without having to have a physics degree from MIT?